Transform your garden-fresh zucchini into a delightful relish that adds a burst of flavor to any dish. This zucchini relish recipe is perfect for topping burgers, hot dogs, or even mixing into salads. With a balance of sweet and tangy notes, it's a versatile condiment that will quickly become a staple in your pantry.
When preparing this recipe, you may need to pick up a few items that aren't always on hand. Celery seed and mustard seed are spices that might not be in your regular spice rack, but they are essential for achieving the unique flavor profile of this relish. You can find them in the spice aisle of most supermarkets.

Ingredients For Zucchini Relish Recipe
Zucchini: Finely chopped to create the base of the relish, providing a mild and slightly sweet flavor.
Onion: Adds a sharp, savory note that balances the sweetness of the zucchini.
Green bell pepper: Contributes a fresh, slightly bitter taste and a crunchy texture.
Red bell pepper: Adds a sweet, vibrant flavor and a pop of color.
Salt: Used to draw out excess moisture from the vegetables and enhance their flavors.
Sugar: Provides sweetness to balance the tanginess of the vinegar and the savoriness of the vegetables.
White vinegar: Adds acidity to the relish, helping to preserve it and giving it a tangy flavor.
Celery seed: Adds a subtle, earthy flavor that complements the other ingredients.
Mustard seed: Provides a mild, tangy heat and a bit of texture to the relish.
Technique Tip for Making Relish
When preparing the zucchini and other vegetables, ensure they are finely chopped to achieve a uniform texture in the relish. This not only helps in even cooking but also enhances the overall appearance and consistency of the final product. Using a food processor can speed up this process and provide a more consistent chop.
Suggested Side Dishes
Alternative Ingredients
zucchini - Substitute with yellow squash: Both have a similar texture and mild flavor, making them interchangeable in most recipes.
onion - Substitute with shallots: Shallots have a milder and slightly sweeter taste, which can complement the other ingredients well.
green bell pepper - Substitute with poblano pepper: Poblano peppers offer a similar texture but add a slight kick of heat for extra flavor.
red bell pepper - Substitute with orange bell pepper: Orange bell peppers have a similar sweetness and crunch, making them a good alternative.
salt - Substitute with kosher salt: Kosher salt has a similar flavor but is less processed, offering a cleaner taste.
sugar - Substitute with honey: Honey provides a natural sweetness and a slightly different flavor profile that can enhance the relish.
white vinegar - Substitute with apple cider vinegar: Apple cider vinegar has a similar acidity but adds a subtle fruity note.
celery seed - Substitute with dill seed: Dill seed offers a similar texture and a complementary flavor that pairs well with the other ingredients.
mustard seed - Substitute with ground mustard: Ground mustard provides the same tangy flavor, though it will integrate more smoothly into the relish.
Other Alternative Recipes Similar to This Relish
How to Store or Freeze Your Relish
Ensure your zucchini relish jars are completely cooled before storing them. This helps prevent condensation inside the jars, which can affect the relish's quality.
Store the sealed jars in a cool, dark place like a pantry or cupboard. The ideal temperature is between 50-70°F (10-21°C). This helps maintain the flavor and texture of the relish.
Once opened, keep the jar of zucchini relish in the refrigerator. It should last for up to 3 months when refrigerated. Always use a clean spoon to scoop out the relish to avoid contamination.
For longer storage, consider freezing the zucchini relish. Transfer the cooled relish into freezer-safe containers or heavy-duty freezer bags. Leave about ½ inch of headspace to allow for expansion during freezing.
Label each container or bag with the date of preparation. This helps you keep track of how long the relish has been stored. Frozen zucchini relish can last up to a year without significant loss of quality.
When ready to use, thaw the frozen zucchini relish in the refrigerator overnight. Avoid thawing at room temperature to maintain food safety and quality.
If you notice any changes in color, smell, or taste, discard the relish. Properly stored, zucchini relish should retain its vibrant flavor and texture for months.
How to Reheat Leftovers
Stovetop Method: Place the zucchini relish in a small saucepan. Heat over medium-low heat, stirring occasionally, until warmed through. This method helps maintain the texture and flavor of the vegetables.
Microwave Method: Transfer the relish to a microwave-safe bowl. Cover with a microwave-safe lid or plastic wrap, leaving a small vent. Heat on medium power for 1-2 minutes, stirring halfway through, until the relish is heated evenly.
Oven Method: Preheat your oven to 300°F (150°C). Spread the zucchini relish in an oven-safe dish and cover with aluminum foil. Heat for about 10-15 minutes, stirring once or twice, until the relish is warmed through.
Double Boiler Method: Place the relish in a heatproof bowl. Set the bowl over a pot of simmering water, ensuring the bottom of the bowl does not touch the water. Stir occasionally until the relish is heated through. This gentle method helps preserve the flavors and textures.
Slow Cooker Method: If you have a larger quantity of zucchini relish to reheat, use a slow cooker. Set it to the low setting and heat for 1-2 hours, stirring occasionally, until the relish is thoroughly warmed. This method is ideal for maintaining the integrity of the vegetables.
Essential Tools for Making Relish
Large bowl: Used to combine and let the vegetables sit with salt for 2 hours.
Colander: Essential for rinsing and draining the vegetables well after they have sat with the salt.
Large pot: Necessary for combining the sugar, vinegar, celery seed, and mustard seed, and for cooking the relish.
Measuring cups: Used to measure out the precise amounts of zucchini, onion, bell peppers, salt, sugar, and vinegar.
Measuring spoons: Used to measure the celery seed and mustard seed accurately.
Cutting board: Provides a surface for finely chopping the zucchini, onion, and bell peppers.
Chef's knife: Essential for finely chopping the vegetables.
Stirring spoon: Used to stir the mixture in the pot to ensure even cooking.
Sterilized jars: Necessary for packing the hot relish to preserve it.
Jar lifter: Used to safely handle the hot, sterilized jars.
Boiling water bath canner: Required for processing the sealed jars to ensure they are properly preserved.
Tongs: Useful for handling hot jars and lids during the sterilization and canning process.
How to Save Time on Making Relish
Pre-chop vegetables: Chop the zucchini, onion, and bell peppers the night before and store them in the fridge.
Use a food processor: Speed up the chopping process by using a food processor instead of chopping by hand.
Simultaneous tasks: While the vegetables are sitting with salt, prepare your jars and boiling water bath.
Batch cooking: Double the recipe and make a larger batch to save time on future relish needs.
Quick rinse: Use a colander to rinse and drain the vegetables quickly and efficiently.

Zucchini Relish Recipe
Ingredients
Main Ingredients
- 4 cups zucchini, finely chopped
- 2 cups onion, finely chopped
- 1 cup green bell pepper, finely chopped
- 1 cup red bell pepper, finely chopped
- ¼ cup salt
- 2 ½ cups sugar
- 2 cups white vinegar
- 1 tablespoon celery seed
- 1 tablespoon mustard seed
Instructions
- Combine zucchini, onion, and bell peppers in a large bowl. Sprinkle with salt and let sit for 2 hours.
- Rinse and drain the vegetables well.
- In a large pot, combine sugar, vinegar, celery seed, and mustard seed. Bring to a boil.
- Add the vegetables to the pot and return to a boil. Reduce heat and simmer for 30 minutes.
- Pack the relish into hot, sterilized jars, leaving ½ inch headspace. Seal and process in a boiling water bath for 10 minutes.
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